import React, { Component } from 'react'

export default class Demo extends Component {

    state = {
        count: 0
    }

    add = () => {
        //对象式的setState
        // //1.获取原来的count
        // const {count} = this.state;
        // //2.更新状态
        // this.setState({
        //     count: count+1
        // })

        //函数式的setState
        this.setState((state) => {
            return {count: state.count+1}
        })
    }

    render() {
        return (
            <div>
                <h1>当前求和为：{this.state.count}</h1>
                <button onClick={this.add}>点我+1</button>
            </div>
        )
    }
}
